sinha: so we have to also teach our students, the workforce, that there is a new science -- repair, renewal, and rehabilitation. that's different from building something new. you cannot fix each and every crack in the city. it's like each city, you're talking about 3,000, 5,000 miles of pipe. so you have to prioritize where they can go and fix the system. narrator: each city faces unique situations, so they must determine the asset management approach that best addresses these challenges. inspections can be done with various technologies, often by a robot... or personally by a technician on a bicycle. sensors detect breaks, cracks, and weaknesses in the pipe. man: we have roots at this cap lateral at 79. narrator: tree roots can grow into the pipe, splitting it apart. man: more light roots at 69. narrator: sometimes they may even find fully collapsed sections. after gathering the data, utilities can assess the need for rehabilitation. sinha: you have to choose the rehabilitation technique so that the life of the pipe can be extended 30 years, 40 years, 50 years. allbee: any asset has an opt